MULTIPLEX Erweitert Wingstabi Owner's manual

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Extended instructions for the WINGSTABI 
from Firmware-Version 1.2.7 
 
Contents 
Basics ............................................................................................................................... 2 
Installation position ........................................................................................................... 3 
Channels .......................................................................................................................... 4 
WINGSTABI initial setup .................................................................................................. 4 
Individualization ................................................................................................................ 7 
Extending control channels .............................................................................................. 8 
Three available basic models ......................................................................................... 10 
Activating the flap control ............................................................................................... 11 
Servo outputs of the WINGSTABI .................................................................................. 12 
Setting up the gyro sensor ............................................................................................. 13 
Gyro phase settings ....................................................................................................... 14 
Regulation (basic) .......................................................................................................... 15 
Regulation (advanced) ................................................................................................... 16 
Tool menu ...................................................................................................................... 19 
Trimming the model ........................................................................................................ 20 
Trim settings by quick switch .......................................................................................... 20 
Trimming using special trimming channels .................................................................... 21 
Trim flight mode .............................................................................................................. 21 
Programming the flap control ......................................................................................... 22 
Motor model with four-flap wing (FunCub XL) ....................................................... 22 
Glider model with four-flap wing (Heron) ............................................................... 26 
Firmware-updates .......................................................................................................... 30 
APPENDIX ..................................................................................................................... 31 
Profi TX trims and telemetry for WINGSTABI ............................................................ 31 
Bluetooth and Android ............................................................................................... 33 
Bluetooth adapter .................................................................................................. 33 
Mobile Launcher .................................................................................................... 35 
Menu structure ....................................................................................................... 36 
Status ..................................................................................................................... 37 
Configuration ......................................................................................................... 37 
Gyro phases .......................................................................................................... 38 
Warranty/disclaimer ........................................................................................................ 39 
Extended Instructions Wingstabi (STHE)  ▪  Errors and omissions excepted!  ▪  © MULTIPLEX 

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Basics

When becoming acquainted with WINGSTABI programming, two possible scenarios

must be considered, which are solved with different WINGSTABI versions: Model pilots

with M-LINK transmitters generally use the WINGSTABI with integrated M-LINK

receiver, while pilots with other RF transmission systems resort to versions without the

integrated receiver.

The WINGSTABI firmware supports RC receivers with the following signal outputs:

PPM, Futaba S.BUS*, MULTIPLEX SRXL, Graupner SUMD and SUMO, Jeti UDI, JR

XBUS Mode B and the S.BUS signal from many other manufacturers such as HiTEC

and FrSky. The serial signals from this receiver are connected using patch-leads with

the IN port (see socket assignment sketch diagram) of the WINGSTABI. A joint power

supply is also guaranteed with this connection. In the WINGSTABI, the receiver type

must of course be selected correctly.

* WINGSTABI is compatible with the Futaba S.BUS signal of the FASST and (from Firmware 1.1.1)

the 12CH mode of the FASSTest receiver.

Transmission systems which work with the MULTIPLEX telemetry protocol can process

the WINGSTABI telemetry data at the MSB port (Multiplex Sensor Bus) and connect

with the MSB input of your receiver. For the WINGSTABI with integrated M-LINK

receiver, this connection is switched internally and additional external sensors can be

connected at the MSB port. The IN port has no function at the WINGSTABI with

integrated receiver and can be used in addition for the power supply with the 7- and 9-

channel versions.

At the B/D port (battery and data), the USB-PC-interface or the Bluetooth module is

connected for programming the WINGSTABI. For settings and updates, the

MULTIPLEX launcher app under Android and the MULTIPLEX launcher under Windows

are available free of charge. At the B/D port of the 9 channel version, the power supply

should also be connected. An external receiver is then supplied with power via the data

connection at the IN port. The 7-channel version has two special BAT ports for power

supply.

The 12- and 16-channel pro versions have two DAT ports instead of the B/D ports for

interfaces (only one of which may be assigned), as well as two MSB ports for telemetry

(both of which may be used at the same time). The two 6-pole MPX sockets with

integrated battery switch are intended for supplying power to the WINGSTABI and the

servos and sensors connected to it. The pro versions may ONLY be supplied with

power via this high-power plug connection. All other connections are protected against

overcurrent with (delay-action) 5A fuses.

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Installation position

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IMPORTANT NOTE: The gyro must be installed completely in parallel to the

flight axis securely in the model. It is imperative that this is observed for all

three axes of the model or the WINGSTABI! Tilted positions lead to corrections

with the wrong control surface, vibrations can unsettle the system (velcro

fastening is therefore NOT recommended).

Figure 2: Installation position view from above

Figure 1: Installation position side view

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Channels

All WINGSTABI versions with or without integrated M-LINK receiver generally accept up

to 16 control channels on the input side (or even 18, depending on RC system). On the

output side, 7, 9, 12 or 16 channels (the more channels the higher the transfer rate) are

available for analog or digital servos, depending on the version. The impulse rate is set

for each servo separately. This means that even a mixed system with analog and digital

servos and various impulse rates in one model is feasible.

Channels that are not to be “supported” can either be guided through by the

WINGSTABI or picked up directly at the servo output of the external receiver. This

applies for aero-tow releases, dropping shaft traps, undercarriage and lighting switches.

The channel distribution in the WINGSTABI is – separated by input and output channels

– fully configurable, meaning it is possible to flexibly adjust to every specified system

pattern.

Mixes should generally take pace in the WINGSTABI. If necessary, a switchable

dualrate and expo would be make sense in the transmitter. If you have to use mixers in

the transmitter in unavoidable individual cases, make sure that no control surface

deflections take place on supported channels, particularly elevator, rudder and ailerons.

The WINGSTABI would receive these signals as intended directional changes and in

heading mode at the least introduce prolonged rudder deflections. This is only possible

without dire side effects in pure stabilization mode.

WINGSTABI initial setup

Now we come to the practical part of setting up the WINGSTABI for your model. When

a WINGSTABI is connected to a PC for the first time with the installed launcher via USB

cable or Bluetooth interface, the basic setting of the system is required. To do this, you

can choose between four options: “Assistant”, “Model template”, “Import” and “Manual”.

In other cases, the transmitter should be connected to the receiver, without any mixers

pre-programmed or connected. Pre-programmed means you must have assigned a

controller and a channel for every axis which is to be controlled and the throttle channel.

With a simple motor model, this would be throttle, ailerons, elevator and rudder. In order

to initially be able to use two or three of the four possible gyro phases, another two- or

three-stage switch with assigned servo channel should be available.

Hint: If the connecting cable of the USB interface is too short for you, do not extend the

three-wire servo cable, but instead the USB cable between the computer and the

interface.

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Figure 4: WINGSTABI pro socket assignment

Figure 3: WINGSTABI socket assignment

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IMPORTANT NOTE: Batteries connected to the WINGSTABI pro are to be

removed at the end of the flight, even if a switch is used for the integrated

battery switch, as the batteries would otherwise slowly but surely discharge due

to the residual current.

For the WINGSTABI with the integrated receiver, the signal transmission between the

receiver and the gyro works automatically. For external receivers, the correct signal

setting must be observed. External MPX receivers must be set via launcher to

MULTIPLEX SRXL; other systems require other settings for the serial data connection.

Observe the instructions of your receiver for this.

If you are a beginner when it comes to controlling the gyro, the “Assistant” is the right

choice, unless you are equipping one of the models listed in the “Model template” box.

The “Assistant” takes you step by step through the basic configuration with lots of

explanations including the correct receiver selection in terms of serial signal format for

external receivers. The correct channel assignment, model type and servo type can be

determined by moving the respective transmitter stick. The servos are connected to the

WINGSTABI as shown in the diagram and its movement direction is verified. The

positioning of the gyro in the model is requested in order to be able to subsequently

check the effective direction of the correction deflections. After this, configuration has

been successfully completed and fine adjustments can be made.

If you retrieve one of the integrated model templates, you are taken through the same

steps, but the optimal gyro settings for the selected model are pre-selected. If you

purchased the model as “RR version” from MPX, the positioning of the gyro and the

movement and effective directions as well as the deflections of all servos have of

course already been programmed in, and must only be verified.

The “Import” option allows you to retrieve gyro configurations which you already have

stored on your PC. These can either be your own files or those from other WINGSTABI

users. The files must be stored in the correct folder. The configuration file names end in

“.wcf“ (wingstabi configuration file).

If you select the “Manual” option right at the start, you are taken directly to the start

screen, which is based on one of the basic configurations stored in the WINGSTABI.

Now you must work your way manually through the menu pages relating to servo

assignment, servo types, servo movement directions, channel assignments and so on,

in order to adjust the WINGSTABI to the actual configuration of your model.

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Individualization

However you made your basic settings, you eventually end up at the start screen.

Manual settings must be made from here. To do this, (almost) every screen page for

basic settings has a basic page and an advanced page for the more seldom required

fine adjustments. To switch, click at the top right in the menu bar with the asterisk.

On the info page, you can find basic information on the WINGSTABI and the current

status of the system. The active gyro phase is displayed and underlined. There should

obviously be a connection between transmitter, receiver and gyro. If this is not the case,

the corresponding alert is shown in red next to “Status”. System errors are stored in a

special error memory. They can be read out and deleted under “Advanced”.

If the status is “Operational” (in green), you can check the three receiver signals for

ailerons, elevator and rudder by moving the controllers. These represent the gyro

sensitivity of these control surfaces, which can be set differently depending on the

phase currently selected. Beneath this you will see a timeline, which displays the

correction signals from the gyro in real time. Move the model with the gyro around each

axis once. The red line denotes the ailerons, the blue the elevator and the green the

rudder.

Figure 5: WINGSTABI info-page

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When you now switch to “Advanced”, you will see the currently defined RC input

channels, all currently assigned servo outputs and the three integrators, which of course

only show deflections if the gyro actually becomes active in the selected phase.

Extending control channels

In the next step, click the radio symbol in the top bar to reach the basic window for

channel assignment. You can change and extend the assignments already entered here

as desired. For example, you can set up an additional transmitter switch channel

(previously assign a two-stage switch in the transmitter to a channel) for the fourth gyro

phase. To do this, click the field for this which is still currently “Not assigned”. After the

assignment window has opened, move the transmitter to the desired switch and identify

it as such. Complete the assignment by clicking the corresponding field. With this

switch, which activates phase 1 in its basic setting, you can approve the remaining

phases on the three-stage switch. Regardless of the current setting, you can always

return to phase 1 using the two-stage switch. The three-stage switch then selects

phases 2, 3 or 4, depending on the positioning. Phase 1 is pre-defined as “Gyro off”,

and should be left that way for safety reasons.

You can now – for instance with a sliding switch or turning knob on the transmitter –

define one to three additional input channels for gyro gain via the transmitter. Channel 6

is selected for this in the default settings. It is usually sufficient to control the sensitivity

of all three axes together with just one channel, as this function is usually only useful for

attaining the optimal gyro effect through flight.

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IMPORTANT NOTE: You can also assign the input channels completely

differently than the suggestions in the model templates or the default values.

Use the usual configuration of your transmitter as a guide. Every manufacturer

has other specifications for this, and every pilot has other preferences. The

following screenshot is an example.

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On the same screen page, you will be shown the telemetry settings for MSB systems.

Here, select M-LINK standard or PROFI-TX (telemetry display) as desired. The PROFI-

TX and the telemetry display emit longer value identifiers than for instance the M-LINK

standard of the Royal SX. Next, sort the sensor addresses according to your

specifications, bearing in mind that double allocations are not permitted. On M-LINK

receivers, the “1” address is reserved for connection monitoring, so please don’t assign

this to something else. The receiver voltage monitoring is also already correctly pre-

selected for M-LINK. If you don’t have any MSB-compatible telemetry, select

“Deactivated”.

Figure 6: WINGSTABI channel asignment

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A red flashing arrow at the top right, as in all menus which enable changes, indicates in

certain situations that the changes you made should be transferred to the gyro, simply

by clicking on the field with the arrow.

If you now switch to the advanced window, you will find the default settings which

shouldn’t be modified unless absolutely necessary. The input fields also provide short

explanations for this when you move the cursor over them.

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IMPORTANT NOTE: After each configuration change, the data you have for

the WINGSTABI should be backed up in a file on your computer. To do this,

use the “Export WINGSTABI settings” menu item in the drop-down menu right

at the top on the left. For this, name the files as clearly as possible, for instance

corresponding with the name of the model or the name of the transmitter

memory. If you want to retrieve the data again, select “Import WINGSTABI

settings” and then the file name.

Three available basic models

By clicking the airplane symbol in the menu bar, the selection window for the basic

model characteristics opens: Delta wing, classic fixed-wing aircraft and V-tail models

are available. On the same side in the basic window, the mixing of spoilers into the

ailerons and flaps activation are also available. Under “Advanced”, you can even

activate a SnapFlap function for classic fixed-wing models, using which you can mix

your elevator deflections to the ailerons with a mixing ratio which can be adjusted by

percentage.

On the same page, an elevator-throttle-compensation is available. This is only required

if a model unintentionally swerves up or, more rarely, down when the motor is activated.

This is a clear sign of an incorrect downthrust, which can be easily corrected here using

an automatic elevator or hydroplane mixing. The point at which the mixing should be

applied can be precisely determined by the minimum throttle value.

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Activating the flap control

Both spoilers and flaps can be configured in various shapes and forms (via gyro

phases, switch channel or special flap phases) from software version 1.2.7 onwards,

meaning four-flap wing for motor models and six-flap wing for glider models can always

comfortably be achieved along with all the necessary elevator compensation. Butterfly is

also a given, as are additional airbrakes or SnapFlap on all desired channels.

Typical models with four flaps are the Heron and FunCub MPX airplanes. With the

Heron, the inner flaps can easily be paired with the ailerons, usually with less travel than

the ailerons themselves. In addition, a so-called Butterfly position can easily be

combined with the inner flaps down and the ailerons (less so) up, as an aid in

descending or an airbrake (spoiler). A small warping with all four flaps up (speed

position) and down (thermal and start positions) is also often desirable.

Whereas with the FunCub, the flaps are usually flat (no flap deflection) at one controller

end, and fully extended at the other controller end. Every position in between (controlled

via three-stage switch or slider) is of course feasible and permitted. However, mixing

with the ailerons is not permitted.

Figure 7: Model and flap pre-selection

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In order to set up the activated flaps in this menu item, a new flap menu symbol appears

after activation behind the airplane symbol. Of course, controllers and channels for flap

control must likewise be assigned at the transmitter end, such as control channels and

flap servos in the WINGSTABI. There is a special chapter dedicated to “Programming

flap control”.

Servo outputs of the WINGSTABI

By opening the menu with the servo symbol, depending on the WINGSTABI version,

varying numbers of servo outputs are displayed, to which the servos installed in the

model must now be correctly assigned. This assignment has NOTHING to do with the

servo channel assignment (coming from the transmitter) at the input side. You are

completely free to choose here. It is nevertheless advisable to follow the standard of

your RC system, in order to have an understandable assignment in the model. MPX

systems generally use servo 1 for the left ailerons, servo 5 for the right ailerons, servo 2

for the elevator, servo 3 for the rudder and servo 4 for the throttle. For changes, click

the corresponding servo on the left, which is then highlighted in red.

Figure 8: Configuring the servo outputs

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Now you can define the function and type of the servo on the right hand side.

Depending on the gyro version, varying numbers of outputs are available. In the middle

next to the conventional HiTEC servo, adjust the servo center and the two end positions

as required in the model for the designated rudder deflections. The values 1100, 1500

and 1900 are set as default. With MPX systems, values up to 1000, 1500 and 2000 are

recommended. If necessary, the direction of rotation of each servo can also be changed

here.

At the end of the servo settings, you can determine for each servo individually what it

should do in case of a loss of reception. With modern brushless regulators for throttle,

“Deactivate servo” is the optimal selection. Otherwise, you can choose between “Hold

position” (standard) or “Set position”. For the latter, it is possible to assume the current

servo position or any position by keyboard entry or with the arrow keys.

Hint: For motor regulators which are operated via the WINGSTABI and which provide

adjustable idle and full throttle positions, you must teach in these positions again!

Setting up the gyro sensor

In the sensor menu item, on the right next to the servo symbol, the installation position

and effective direction of the WINGSTABI can be adjusted in the basic window.

Normally, you will have already done this at the beginning in the assistant mode. In the

advanced window, you can also adjust settings for low-pass filter and deadband.

However, you should not change the default settings for these unless absolutely

necessary. For a model with a combustion engine and strong vibrations, the regulation

can for instance be improved by a smaller cutoff frequency for the low-pass filter.

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Gyro phase settings

We are now approaching the actual gyro settings, which will of course be different in

each of the switchable gyro phases. For safety reasons, no changes should be made in

gyro phase 1; this is the standard setting ex works without any regulation (gyro off).

This makes it possible to always be “rescued” during a flight if something goes wrong

due to a disadvantageous setting.

Right-click the “1” symbol. You will then see the standard setting in the first line and the

available alternatives underneath. This is set up like this for all phases, and makes the

settings considerably easier. Phase 2 is normally used for damping (standard or

optimized), phase 3 for fully stabilized (heading hold) and phase 4 for aerobatics, i.e. a

very extreme heading mode.

Incidentally, you can copy all values of a gyro phase into any other phase using

drag&drop (with the mouse). This is useful if for instance you want the settings for

phase 3 (moderate heading) which you gained during flight to be assumed in phase 4

(hard heading), so you can then “tighten” them there.

By clicking “Advanced”, you can make fine adjustments to whichever gyro phase is

currently selected. These adjustments are fully explained in the following section. In

these windows, an individual CombiSwitch can be programmed separately for each

gyro phase, and a static elevator offset can be set depending on the phase.

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IMPORTANT NOTE: All default settings of the WINGSTABI can be modified

either using the slider, the arrow keys, or by entering the exact numbers using

the keyboard. After modifications have been made, these must always be

transferred into the WINGSTABI and it is recommended that they are also

backed up in a file.

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Regulation (basic)

Sensitivity via transmitter

With the aid of a special sensitivity channel, the global sensitivity (gain) of the axis can

be influenced from the transmitter. Various areas can be adjusted – for example +/-10.

If, for example, you have set the global sensitivity to 40, and the area to +/-10, you can

vary the sensitivity via the transmitter from 30 to 50.

Sensitivity (global)

The global sensitivity affects all components of the regulator, i.e. P, I and D (explanation

on the following page). If the ideal ratio between P, I and D have been acquired through

flight, the total adjustment of the system can be carried out using global gain.

Depending on the weather conditions, it might make sense to slightly increase or

decrease the global sensitivity.

Figure 9: Basic regulations

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Maneuverability / roll rate

If for instance the model reacts too strongly to control inputs, reduce the value to under

100. If you want the model to respond faster, set the value to over 100. Increments of

10 make sense here.

Regulation (advanced)

Direct input

This refers to the control input which is passed on directly to the control surfaces without

regulation. A direct input that is too small leads to an indirect and slow control behavior.

A direct input that is too large can cause the model to roll back when the stick returns to

the center with active regulation with the I input.

Figure 10: Advanced settings in gyro phase 3

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Proportional (P input)

The P input of the PID regulation reacts quickly to regulation deviations. This is a factor

of the recognized regulation error (deviation between the actual and setpoint values).

The main input of the regulation comes from the P input.

Sensitivity

If the P input is set too low, the control feeling can be too “soft”. The axis ratchet also

feels very soft and sluggish in this case. If, however, the P input is set too high, the

corresponding axis can oscillate quickly. It also oscillates when the stick returns to the

center.

Integral (I input)

The I input is the so-called “heading hold” input. Here, the regulation errors are added

up and used for stabilization. It is the “memory” of the regulation: If a model using I

inputs rotates, the model rotates itself back to the initial position on its own. With P and

D factors, rotating of the model is actively regulated against. If, however, the model still

rotates, it stays in the new position. The I regulation reacts relatively slowly.

Sensitivity

If the I input is set too low, the flight attitude of the fixed-wing model is not maintained

well. If the rudders are trimmed or if there are any wind effects, the model may drift. If

the I input is set too high, the corresponding axis can oscillate slowly. An imprecise

effect can also be seen when the stick returns to the center.

Integrator size (maximum)

The maximum integrator size indicates how many “errors” the regulator can store. If the

model drifts off the desired flight direction due to wind, this value indicates how far the

model can be turned back in the original flight direction by the regulator.

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A big integrator ensures a very stable regulation, as a great many errors influences can

be detected and corrected. During aerobatics, an integrator that is too large can lead to

problems for maneuvers involving stalls, as the integrator is filled during the stall, but

cannot be controlled. As soon as the rudder effect is restored, the saved error value of

the integrator is processed. This can lead to poor ratcheting or continued rotation of the

model.

If the integrator is selected too small, the I regulator has hardly any influence on the

regulation result. Consequently, the flight direction cannot be maintained under certain

circumstances.

Return

The I regulation is an automatic return of the rudder into the neutral position during

return. Large values lead to a quick return. If the damping is set to 0, there is no return

of the rudder; the axis is now in heading hold mode. The heading hold effect can be

continuously adjusted using the damping parameters. Hard heading hold ensures an

extremely stable attitude control. Wind effects and also trimmed control surfaces are

corrected.

Hint: If a stable knife edge flight is expected in gyro phase 3, the return for the rudder

must be set to “0”. However, this must then be actively controlled at all times.

For aerobatics (snap rolls, corkscrews), heading hold might lead to imprecise regulation

if the I input and also the integrator are very large. This effect occurs as soon as the

model stalls. The regulation tries to compensate for this stall, but only intensifies the

stall and overshoots. If these maneuvers are to be flown, the integrator should be set

relatively small. The return should be increased as well.

The return can also be controlled depending on the transmitter. As soon as it is

controlled, the heading hold effect is consequently weakened as desired. This has many

advantages for critical (sluggish) models and for aerobatics with maneuvers which

almost cause the model to stall.

It often makes sense to calculate with a slight time-lag for the return via stick deflection,

because the phase of the stick returning to the center position can also profit from the

return (with more sluggish models/servos..). On the other hand, you should return to

heading hold as quickly as you can after the stick has returned to the center position, in

order to achieve maximum stability. So if the ratchet looks imprecise, the delay value

should be made smaller. If the model rotates away slightly and then holds its attitude

after the stick has returned to the center, the delay time is too long. In this case, the

value can be increased.

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Differential (D input)

The D input reacts to how strongly the last correction was regulated against. The D

factor therefore serves to accelerate the regulation. Please use the D input very

carefully. Increase the D sensitivity in small increments starting at 0. If the D input is set

too high, this quickly causes the model to oscillate.

Sensitivity

If the D input is set too high, the corresponding axis can oscillate quickly. It oscillates

when the stick returns to the center.

Tool menu

Here, you can adjust the servo travels (min–neutral/medium–max) of your transmitter to

the servo travels selected in the WINGSTABI. The adjustment should always be in the

green area. Readjust the travels in the transmitter if they stray into the orange areas.

There is also a menu item for controlling the effective direction of the sensors here. In

addition, the instructions for the WINGSTABI are effectively “online”.

Figure 11: WINGSTABI tool menu

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Trimming the model

It is generally not allowed to trim on the transmitter when using the WINGSTABI, as in

heading mode every trim would be received as a desired control surface position

change. If necessary, as long as you only use the damping (phase 2) of the

WINGSTABI or have switched off the WINGSTABI via phase 1, you can trim. Trimming

can be used to properly fly in the model for the first time. Any trimming carried out after

that is assumed mechanically, in order to then neutralize the trim on the transmitter

again. The trim flight mode is available as an alternative.

Trim settings by quick switch

There is another trim travel: Select gyro phase 1 at the start and do not switch to other

gyro phases during flight. Use the trim on the transmitter, until the model is in neutral

flight. Now land the model. By quickly toggling the gyro phase switch, the affected trim

settings must now be transferred to the WINGSTABI and taught in.

Procedure: Quickly move the gyro phase switch to and fro 4 to 5 times. This will enable

the trim settings gained through flight to be taught into the WINGSTABI as the neutral

position. You can monitor the programing of the trim settings by switching to gyro

phases 3 or 4. It must now be ensured that the trimmed control surfaces do not “stray”

out of the neutral position.

Now you can theoretically take off again immediately, whereas of course all phases may

be used. It makes more sense to switch off the WINGSTABI after successfully setting

the trim, setting the trim on the transmitter back to neutral and then switching the

WINGSTABI back on again. Now it takes the center positions, which were taught in

previously using the trim settings, as standard and you have the entire trim travels at

your disposal on the transmitter again should you need them.

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IMPORTANT NOTE: During initial flight of the model, you should only fly in

phase 1 using one of the above mentioned trim methods. You may only fly in

“supported” phases once the model has been trimmed correctly and the trim

values have been saved in the WINGSTABI.

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